mechanically pumped fluid loops: components and systems ... · pacific design technologies, inc....

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AS9100

Certified

Company

PDT Proprietary

1

Mechanically Pumped Fluid Loops: Components and Systems for Space

Applications

6300 Lindmar Drive

Goleta, CA 93117

Ph: (805) 961-9110

Fax: (805) 961-9120

www.pd-tech.com

[first initial].[last name]@pd-tech.com

PACIFIC DESIGN

TECHNOLOGIES, INC.

Thermal & Fluids Analysis Workshop

August 13, 2012

Pasadena, CA

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2

Pacific Design Technologies, Inc.

AS9100 Certified Company

Mechanically Pumped Fluid Loops

• Typical Mechanically Pumped Fluid Loop

• System Considerations

• Past and Present Systems

• Testing Protocol

• Performance Measurement

• Future Trends

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Pacific Design Technologies, Inc.

AS9100 Certified Company

Typical Mechanically-Pumped Fluid Loop

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4

Pacific Design Technologies, Inc.

AS9100 Certified Company

Liquid Cooling Systems for Airborne Applications

BAMS LSCU

Firescout LCS

ISR Aircraft LCS

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5

Pacific Design Technologies, Inc.

AS9100 Certified Company

Liquid Cooling Systems for Space Applications

MSL Integrated Pumping Units

ISSA Satellite Refueling Demo. AMS-2 Pump and Controller

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Pacific Design Technologies, Inc.

AS9100 Certified Company

System Considerations

Define Operational /

Non-operational

Environments

Define Cooling

Requirements and

Heat Transfer

Method

Heat Transfer capacity /

method drives the flowrate,

pressure drop, heat

exchanger size, etc.

Primary Environments which

affect system design are:

- Temperature ranges

- Altitude

- Vibration / Shock

Required to select and

size the pump / motor

Requires definition of line size

and hydraulic layout

Operational Voltage(s) -

Input Power Limit -

Input VA Limit -

Power Factor Requirements -

EMI Requirements -

System Warm-Up Time -

Fluid Temperature Control -

Reliability / Life -

Noise Limits -

Built-In-Test Features -

etc. -

- Size

- Weight

- Electrical Interface

- Mechanical Interface

Required to size the

accumulator

Calculate Required

Fluid

Flowrate & Pressure Drop

Calculate System

Fluid Volume

Define

System Power

Source and Limits

Define

Physical Parameters

Define

Special Conditions

Select

Coolant(s)

- Specific Heat -

- Viscosity -

- Thermal Conductivity -

- Specific Gravity -

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Pacific Design Technologies, Inc.

AS9100 Certified Company

Unique Requirements for Space Applications

Challenge Feature(s) Benefit

Long-duration

missions

• All-welded construction

(no elastomeric seals)

• Flooded pump motors

(no shaft seals)

High reliability

Strict cleanliness

and material

compatibility

requirements

• CRES wetted materials

• Canned (sealed) motors

• Carbon bearings

Reduced potential

for material

interactions

Wide temperature

range

• Limited material list

• Appropriate fits/clearances

Reduces thermal

expansion issues

Tight power budget • Small motors

• Low flow rates

• Minimize system pressure drop

• Passive thermal control valves

Reduced power

consumption

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Pacific Design Technologies, Inc.

AS9100 Certified Company

Past and Present Systems

Integrated Pump Assemblies

• Mars Pathfinder (cruise stage)

• Mars Exploration Rover (cruise stage)

• Mars Science Laboratory

(cruise stage and rover)

Pumps and Accumulators

• AMS-2 Tracker

• Satellite Refueling Demonstrator

Thermal Control Valves

• Part of Mars IPA’s

• “Smart” Loop Heat Pipes

(ground demo projects)

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Pacific Design Technologies, Inc.

AS9100 Certified Company

Testing Protocol

Typical Test Sequence

• Component performance testing, lab

ambient environment

• Pre- and Post-Welding performance, lab

ambient environment

• Proto-flight Vibration and Shock

• Thermal Vacuum Cycling

• Performance Mapping

• Integration testing (by customer)

• Vehicle testing (by customer

MSL Hardware Testing

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Pacific Design Technologies, Inc.

AS9100 Certified Company

Performance Measurement

Pump Performance

• Flow, pressure rise and power consumption

• Speed control, start-up and high/low

temperature performance

• Current/Power Limiting circuitry

• Fault detection/Speed output signals

Centrifugal Pump

Performance Map

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Pacific Design Technologies, Inc.

AS9100 Certified Company

Performance Measurement

Accumulator Performance

• Displaceable volume

• Pressure vs. volume performance

Thermal Control Valve Performance

• Flow rate vs. temperature

• Flow and pressure drop performance

Accumulator Performance Test

Thermal Control Valve

Performance Map

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Pacific Design Technologies, Inc.

AS9100 Certified Company

Future Trends

Performance Enhancements

• Higher pump efficiency through impeller changes,

and multi-stage pumps

• Sensorless motor controls to eliminate position

sensors

• High temperature electronics

• Controller miniaturization

Alternate Fluids

• Reduce use of ozone-depleting

chemicals

Thermal Control Valves

• New system architectures

Multi-stage Pump Impellers

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Pacific Design Technologies, Inc.

AS9100 Certified Company

Summary

• Pumped-loop systems provide relatively high capacity heat

transfer performance in a small package

• High reliability systems have been proven through multiple

long-duration missions

• Electric power consumption can be minimized through proper

system sizing

• Materials and processes well established

• Established supply base minimizes program risk

• Advances in electronics offer future improvements in

size/weight/power

• Innovative architectures under development